| 1 | import asyncio |
| 2 | import logging |
| 3 | import websockets |
| 4 | from datetime import datetime, timezone |
| 5 | |
| 6 | from ocpp.routing import on |
| 7 | from ocpp.v201 import ChargePoint as cp |
| 8 | from ocpp.v201 import call_result |
| 9 | from ocpp.v201.enums import RegistrationStatusType, GenericDeviceModelStatusType |
| 10 | |
| 11 | # Setting up the logging configuration to display debug level messages. |
| 12 | logging.basicConfig(level=logging.DEBUG) |
| 13 | |
| 14 | # Define a ChargePoint class inheriting from the OCPP 2.0.1 ChargePoint class. |
| 15 | class ChargePoint(cp): |
| 16 | # Define a handler for the BootNotification message. |
| 17 | @on('BootNotification') |
| 18 | async def on_boot_notification(self, charging_station, reason, **kwargs): |
| 19 | logging.info("Received BootNotification") |
| 20 | # Create and return a BootNotification response with the current time, |
| 21 | # an interval of 10 seconds, and an accepted status. |
| 22 | return call_result.BootNotification( |
| 23 | current_time = datetime.now(timezone.utc).isoformat(), |
| 24 | interval=10, |
| 25 | status=RegistrationStatusType.accepted |
| 26 | ) |
| 27 | |
| 28 | # Define a handler for the GetBaseReport message. |
| 29 | @on('GetBaseReport') |
| 30 | async def on_get_base_report(self, request_id, report_base, **kwargs): |
| 31 | try: |
| 32 | logging.info(f"Received GetBaseReport request with RequestId: {request_id} and ReportBase: {report_base}") |
| 33 | |
| 34 | # Create a mock response for demonstration purposes, indicating the report is accepted. |
| 35 | response = call_result.GetBaseReport( |
| 36 | status=GenericDeviceModelStatusType.accepted |
| 37 | ) |
| 38 | |
| 39 | logging.info(f"Sending GetBaseReport response: {response}") |
| 40 | return response |
| 41 | except Exception as e: |
| 42 | # Log any errors that occur while handling the GetBaseReport request. |
| 43 | logging.error(f"Error handling GetBaseReport request: {e}", exc_info=True) |
| 44 | # Return a rejected status in case of error. |
| 45 | return call_result.GetBaseReport( |
| 46 | status=GenericDeviceModelStatusType.rejected |
| 47 | ) |
| 48 | |
| 49 | # Function to handle new WebSocket connections. |
| 50 | async def on_connect(websocket, path): |
| 51 | """ For every new charge point that connects, create a ChargePoint instance and start listening for messages. """ |
| 52 | try: |
| 53 | requested_protocols = websocket.request_headers['Sec-WebSocket-Protocol'] |
| 54 | except KeyError: |
| 55 | logging.info("Client hasn't requested any Subprotocol. Closing Connection") |
| 56 | return await websocket.close() |
| 57 | |
| 58 | if websocket.subprotocol: |
| 59 | logging.info("Protocols Matched: %s", websocket.subprotocol) |
| 60 | else: |
| 61 | logging.warning('Protocols Mismatched | Expected Subprotocols: %s,' |
| 62 | ' but client supports %s | Closing connection', |
| 63 | websocket.available_subprotocols, |
| 64 | requested_protocols) |
| 65 | return await websocket.close() |
| 66 | |
| 67 | charge_point_id = path.strip('/') |
| 68 | cp = ChargePoint(charge_point_id, websocket) |
| 69 | |
| 70 | # Start the ChargePoint instance to listen for incoming messages. |
| 71 | await cp.start() |
| 72 | |
| 73 | # Main function to start the WebSocket server. |
| 74 | async def main(): |
| 75 | # Create the WebSocket server and specify the handler for new connections. |
| 76 | server = await websockets.serve( |
| 77 | on_connect, |
| 78 | '0.0.0.0', # Listen on loopback. |
| 79 | 9000, # Port number. |
| 80 | subprotocols=['ocpp2.0', 'ocpp2.0.1'] # Specify OCPP 2.0.1 subprotocols. |
| 81 | ) |
| 82 | logging.info("WebSocket Server Started") |
| 83 | # Wait for the server to close (runs indefinitely). |
| 84 | await server.wait_closed() |
| 85 | |
| 86 | # Entry point of the script. |
| 87 | if __name__ == '__main__': |
| 88 | # Run the main function to start the server. |
| 89 | asyncio.run(main()) |